Hi,
We have a host, Solaris 10 10/08 s10s_u6wos_07b on SPARC.
SWAP is on ZFS.
We allocated two swap devices of 64G each, for a total of around 130G.
Over the time, swap space usage is increasing until 96% of used:
# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
swap_space 130G 125G 4.94G 96% ONLINE -
# zfs list
NAME USED
AVAIL REFER MOUNTPOINT
swap_space 127G
487M 1K none
swap_space/swapvol01 64G 2.03G
62.4G -
swap_space/swapvol02 63G 1.02G
62.5G -
ZFS parameters for swap space volume:
# zfs get all swap_space
NAME PROPERTY VALUE SOURCE
swap_space used 127G -
swap_space available 487M -
swap_space referenced 1K -
swap_space quota none default
swap_space reservation none default
swap_space compressratio 1.00x -
[...]
In swap_space, I have two volumes, swapvol01 and swapvol02:
# zfs get all swap_space/swap_space_01
NAME PROPERTY VALUE SOURCE
swap_space/swapvol01 type volume -
swap_space/swapvol01 creation Thu Mar 11 9:22 2010 -
swap_space/swapvol01 used 64G -
swap_space/swapvol01 available 2.03G -
swap_space/swapvol01 referenced 62.4G -
swap_space/swapvol01 compressratio 1.00x -
swap_space/swapvol01 reservation none default
swap_space/swapvol01 volsize 64G -
swap_space/swapvol01 volblocksize 8K -
swap_space/swapvol01 checksum off inherited from
swap_space
swap_space/swapvol01 compression off default
swap_space/swapvol01 readonly off default
swap_space/swapvol01 shareiscsi off default
swap_space/swapvol01 copies 1 default
swap_space/swapvol01 refreservation 64G local
# zfs get all swap_space/swap_space_02
NAME PROPERTY VALUE SOURCE
swap_space/swapvol02 type volume -
swap_space/swapvol02 creation Tue Jan 18 9:14 2011 -
swap_space/swapvol02 used 63G -
swap_space/swapvol02 available 1.02G -
swap_space/swapvol02 referenced 62.5G -
swap_space/swapvol02 compressratio 1.00x -
swap_space/swapvol02 reservation none default
swap_space/swapvol02 volsize 63G -
swap_space/swapvol02 volblocksize 8K -
swap_space/swapvol02 checksum off inherited from
swap_space
swap_space/swapvol02 compression off default
swap_space/swapvol02 readonly off default
swap_space/swapvol02 shareiscsi off default
swap_space/swapvol02 copies 1 default
swap_space/swapvol02 refreservation 63G local
However, if we do swap -s, we have more than 54GB of free space (swap file name
is changed for confidentiality):
# swap -s
total: 51745880k bytes allocated + 39077200k reserved = 90823080k used,
56984152k available
# swap -l
swapfile dev swaplo blocks free
/dev/swapvol01 256,1 16 134217712 120021888
/dev/swapvol02 256,2 16 132120560 117956320
I understand that "swap -l" only show space used on those devices and "swap -s"
include physical memory AND backing store. So logically, we should see a low
usage of both swap devices ... ?
But, /tmp, /etc/svc/volatile and /var/run directories aren't used:
# df -h /tmp /var/run /etc/svc/volatile
Filesystem size used avail capacity Mounted on
swap 54G 8.8M 54G 1% /tmp
swap 54G 232K 54G 1% /var/run
swap 54G 1.6M 54G 1% /etc/svc/volatile
We have 20 zones but no one is taking many space in those directories (cut many
lines for better reading):
# for i in `zoneadm list |grep -v global`; do zlogin $i df -h /tmp; done
Filesystem size used avail capacity Mounted on
swap 55G 275M 54G 1% /tmp
swap 55G 270M 54G 1% /tmp
swap 55G 541M 54G 1% /tmp
swap 55G 274M 54G 1% /tmp
swap 55G 215M 54G 1% /tmp
swap 55G 281M 54G 1% /tmp
swap 54G 328K 54G 1% /tmp
swap 54G 520K 54G 1% /tmp
swap 55G 541M 54G 1% /tmp
swap 56G 1.4G 54G 3% /tmp
swap 54G 576K 54G 1% /tmp
swap 54G 328K 54G 1% /tmp
swap 54G 432K 54G 1% /tmp
swap 55G 270M 54G 1% /tmp
swap 54G 40K 54G 1% /tmp
swap 54G 4.5M 54G 1% /tmp
swap 54G 8K 54G 1% /tmp
swap 54G 0K 54G 0% /tmp
swap 54G 40K 54G 1% /tmp
swap 54G 64K 54G 1% /tmp
Any ideas? Because I'm puzzled ... !
Thanks!
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